Resolution from British united after reverse (8)
I believe the answer is:
backbone
'resolution' is the definition.
(thesaurus)
'british united after reverse' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'united' becomes 'one' (as in a phrase like 'we are one').
'after' means one lot of letters go next to another.
'reverse' becomes 'back' (I've seen this before).
'b'+'one'='bone'
'bone' put after 'back' is 'BACKBONE'.
'from' is the link.
(Other definitions for backbone that I've seen before include "Fortitude - protection for the spinal cord" , "Spinal column courage" , "Firmness of character" , "Informal courage of spinal kind" , "Lt protects the spinal cord" .)